ToolDefinitionFile is generated by PlatformAutoGen.ToolDefinition() Code assume ToolDefinition is always called before using ToolDefinitionFile, but in some cases, it's not true. This patch is to fix this issue. Cc: Liming Gao <liming.gao@intel.com> Signed-off-by: Bob Feng <bob.c.feng@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>